I received a 88 ported cylinder from a friend. The cylinder has the logo "PP" engraved on it. When they ported the cylinder they epoxied the transfer ports on the intake side shut. They also cut the exhaust ports very high. The bore of this cylinder is at 69mm or .120 over. My friend was not the origional owner but he was told that this cylinder was made for awsome mid to high end and that it was suppose to use a Suzuki piston of some kind. Has anyone ever heard of "PP". What piston do I need to run? Can I run an 86 250R piston with a spacer plate. Is it on its last bore, or is there a big bore sleve in it? Thanks I would appreciate any info you may have.

Brian - Michigan
87 Honda TRX250R
nerfbars@excite.com

 

I am thinking maybe power pro's.But I am pretty sure they have something to do with trinity.So maybe call them.Also if the cylinder is setup to use a a suzuki piston a honda might not work.Because the location of the ports are different than stock?Not sure on the last part though.

 

Never heard of using a suzuki piston but they may have used an 86 trx piston with a spacer plate when using an 87-89 trx crank. Do you have the old piston or any pics of the cylinder?

You're probably done as far as bore jobs but if the piston clearance is still good you may be able to get a new pro-x 69mm piston. Wiseco used to make upto .140 over pistons but that bore size after 69mm is not always usuable and I believe wiseco has discontinued piston sizes over 68mm.

On the epoxy job they only filled the rear hooks of the transfer port? This port work sounds similar to what I've done to mine and it will run very strong on mid/top end if done right.

 

No I wish I had an old piston. I can probably take a few pics when I get it back from being polished. This guy said he'd polish the outside of the cylinder and head for like $60 so I let this cylinder be my lil test cylinder. I am planning on running a 86 .120 over 69mm piston with a spacer plate unless someone knows exactly what piston belongs in it. Someone thought an Suzuki RM piston might be the one, but do they offer a 69mm piston? Yes they filled the two little transfer ports that hook down on both sides of the intake side of the cylinder. Thanks for trying to help, it is much appreciated.

 

the only thing that comes to mind is HPP, Honda Performance Porting. Its on most honda CR's

 

Price Performance

 

**** Pore haha I couldnt resist.

 

Curt234, do you know for sure that Price Performance is the name of the company or are you just throwing out an idea? Mr350X, there is nothing **** pore when it comes to a Honda 250R! Thanks for the help!

 

No just thowing in an idea. I think price performance just does snowmobiles. on the logo does it have a nuclear sign? IF not than it not them.

 

Nerfbars, I was just messin round'! Trust me, I know as well as anyone that
there is nothing **** pore about an R!!!

There was a thread a while back about Hondas quality being "**** pore".
I know better, though.

-Matt